At what speeds does the Token Ring protocol operate?

The Token Ring protocol operates at speeds of 4 Mbps and 16 Mbps, making this the correct choice. Token Ring is a networking technology that was developed by IBM and is characterized by its token-passing protocol, which controls access to the network among connected devices. Initially, the standard speed was 4 Mbps, which later evolved to support a higher rate of 16 Mbps, allowing for faster data transmission and improved network performance.

This design allowed Token Ring to maintain a structured method of data transfer, reducing the chances of collisions and ensuring a predictable flow of information. In contrast, the other options present speeds that do not align with the historical functionality and capabilities of the Token Ring protocol, thus affirming the accuracy of the selected answer.